Analysis Of A Full Journal Bearing and the Effect of Wear on Performance By: Marc Desjardins.

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Presentation transcript:

Analysis Of A Full Journal Bearing and the Effect of Wear on Performance By: Marc Desjardins

Proposal Detailing the theoretical analysis of a full journal bearing will be performed and compared to the results obtained by a computational fluid dynamic (CFD) analysis. Wear, it’s potential causes, and prevention will be described and complemented by a CFD analysis of the effect of wear severity and location on the bearing performance and fluid characteristics. The analysis will suggest possible system changes to correct problems resulting from wear.

What Bearing Wear Looks Like

How this analysis will be done 1. An in-depth explanation of lubrication and bearing theory and the derivation of the some of the classical equations used in bearing analysis. 2. A mathematical/theoretical analysis of a typical journal bearing with known inputs (rotational speed, length, clearance, etc.). 3. The same journal bearing analyzed above will be modeled and evaluated in COMSOL using a 2-dimensional fluid analysis. The results of the COMSOL analysis will be then be compared to the theoretical analysis. 4. The severity of wear will be varied to investigate the relationship between material loss and load capacity, pressure, and fluid velocity. 5. The radial location of a constant wear area will be varied along critical portions of the bearing to analyze the effect of wear location.

COMSOL Models Fluid pressure in typical journal bearing Wear Site Fluid pressure in typical journal bearing Example of Modeling Wear

Analysis Will Include: Wear Depth Vs Load Capacity, Maximum Pressure and Velocity Wear Location Vs Load Capacity, Maximum Pressure, and Velocity Potential system changes to reverse or negate the impact of bearing wear will be analyzed and suggested